1.Support file format:MP3 2.Communication protocols:USB2.0 3.Frequency response:20-20KHz 4.SNR:About 75db (1KHz) 5.FM frequency range:87.5MHz-108MHz 6.Extermal power supply: USB5V/350mA 7.Recharge time: 3 hours 8.Battery life(full):6 hours 470*420*470(mm)color: pink ,green, blackAs MP3 Micro SD card headphoneAs FM radioAs Multimedia computer headphone SD Card MP3 player Music Wireless Headphone